How could two circles be connected when one has an interrupted edge ring?
This is actually because you have a mis-matched vertex count, most likely because of a mirroring error:



You also seem to have a duplicate of the speaker:



To fix this:




Select a vertex on the speaker and press CtrlL to select connected geometry, then press Delete> vertices to delete it.
Select the extra loops on the sides and delete them with Delete > Edge loops
Bridge edge loops now works as expected.